Question

我在使用C＃中的Epplus生成piviot table时遇到了一些问题。在生成表之后，我想基于此表创建piviot表：
http://imgur.com/Agxp1mK
在将数据透视表添加到spreedsheet之前一切都很好但是在保存流中添加下面的代码后抛出异常：

类型＆＃39; System.NullReferenceException＆＃39;的例外情况发生在EPPlus.dll但未在用户代码中处理附加信息：对象引用未设置为对象的实例。

在时间配音中，我无法找到空的对象我的调试轨道：

System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=EPPlus
  StackTrace:
       at OfficeOpenXml.ExcelWorksheet.SavePivotTables()
       at OfficeOpenXml.ExcelWorksheet.Save()
       at OfficeOpenXml.ExcelWorkbook.Save()
       at OfficeOpenXml.ExcelPackage.Save()
       at OfficeOpenXml.ExcelPackage.SaveAs(Stream OutputStream)
       at TestController.GetSpreedsheetPivot(ExcelPackage package, String fileName)
       at lambda_method(Closure , ControllerBase , Object[] )
       at System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters)
       at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12()
       at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)

代码：

FileInfo newFile = new FileInfo("Excel.xlsx");
ExcelPackage pkg = new ExcelPackage(newFile);

ExcelWorksheet worksheet = pkg.Workbook.Worksheets.Add("Table");
worksheet.Cells["A1"].LoadFromDataTable(table, true); //add datatable values to worksheet

//Create pivot table at A20 using values from A1:F10 named pivTable
var pivotTable = worksheet.PivotTables.Add(worksheet.Cells["H1"], worksheet.Cells["A1:E63"], "pivTable");

//Assign which Rows and Columns of A1:F10 are data or headers
pivotTable.ShowHeaders = true;
pivotTable.FirstHeaderRow = 1;
pivotTable.FirstDataCol = 1;
pivotTable.FirstDataRow = 2;

//Row Labels
pivotTable.RowFields.Add(pivotTable.Fields["Grid"]);
pivotTable.RowFields.Add(pivotTable.Fields["Story"]);
pivotTable.RowFields.Add(pivotTable.Fields["Zone"]);
pivotTable.DataOnRows = false;

pivotTable.DataFields.Add(pivotTable.Fields["Quantity"]);

pivotTable.ColumnFields.Add(pivotTable.Fields["Name of material"]);

var stream = new MemoryStream();
pkg.SaveAs(stream);

string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

stream.Position = 0;
return File(stream, contentType, fileName)

使用C＃中的Epplus生成数据透视表期间的NullReferenceException

0 个答案: